Sayyidah Umm Salamah (may Allah be pleased with her) narrates: In the first year the Prophet (peace and blessings be upon him) observed i'tikaf in the first ten days, then he observed i'tikaf in the middle ten days, then he observed i'tikaf in the last ten days, and he said: "I saw Laylat al-Qadr in these (ten nights), then I was made to forget it." After that, the Prophet (peace and blessings be upon him) continued to observe i'tikaf in the last ten days until he passed away.
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5024
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (412/23)»